Effect of mean stress on hydrogen assisted fatique crack propagation in duplex stainless steel

T.J. Marrow, C.A. Hippsley, J.E. King

Research output: Contribution to journalArticlepeer-review

Abstract

Hydrogen assisted subcritical cleavage of the ferrite matrix occurs during fatigue of a duplex stainless steel in gaseous hydrogen. The ferrite fails by a cyclic cleavage mechanism and fatigue crack growth rates are independent of frequency between 0.1 and 5 Hz. Macroscopic crack growth rates are controlled by the fraction of ferrite grains cleaving along the crack front, which can be related to the maximum stress intensity, Kmax. A superposition model is developed to predict simultaneously the effects of stress intensity range (ΔK) and K ratio (Kmin/Kmax). The effect of Kmax is rationalised by a local cleavage criterion which requires a critical tensile stress, normal to the {001} cleavage plane, acting over a critical distance within an embrittled zone at the crack tip. © 1991.

Original languageEnglish
Pages (from-to)1367-1376
Number of pages10
JournalActa Metallurgica et Materialia
Volume39
Issue number6
DOIs
Publication statusPublished - Jun 1991

Keywords

  • hydrogen
  • iron and steel metallography
  • stresses
  • Ferrite
  • fatigue crack propagation
  • stainless steel

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